Friction device for log handlers



Oct. 30, 1923.

1,472,726 r J. M. M LAUGHLIN FRICTION DEVICE FOR LOG HANDLERS Fil ed Nov. 30 1921 2 Sheets-Sheet 1 J M. M LAUGHLIN FRICTION DEVICE FOR LOG HANDLERS Filed Nov. '50 i921 2 Sheets-Sheet 2 Patented Get. 30, 1923.

TATE teams JAMES MGLAUGHLIN, OF PORTLAND, OREGON.

FRICTION DEVICE non LOG HANDLERS. 2

Application filed November so, 1921. Serial No. 518,889.

To allwhomit may concern; V 7

Be it known that I, JAMEs M. MCLAUGH- LIN, a citizen of the United States of America, residing at Portland, in the county of Multnomah and State of Oregon, have invented new and" useful Improvements in Friction Devices for LogHandlers, of which the following is a specification.

The object of the invention is to provide a friction device for the control of a drum in connection with log handling and similar apparatus, which may be alternatively operable manually and bysteam or other fluid pressure, such as compressed air' or thelike and incidentally to provide ameans for applying pressure to the drum in the closing of the clutch whereby the wearing of the key or gib and the strain thereon are minimized to avoid the risk of breaking or otherwise causing damage thereof and thereby impairing the mechanism or putting the same out of commission when the holding of'the drum is necessary; and with these objects in view the invention consists in a construction and combination of parts of which a preferred embodiment is shown in the accompanying drawings, wherein:

Figure lis a longitudinal sectional view oia fraction devlce' embodying the invention applied in the operative position to a conventional form of drum.

Figures 2, 3, 4, 5 and 6 are cross sectional views respectively on the planes indicated by the lines 2-2, 33, 41-4,55 and 6-6 of Figure 1.

Figure 7 is a detail view of the piston by which the follower is actuated.

The apparatus consists essentially of a follower 1O fitted for longitudinal. movement in a sleeve 11 and keyed thereto as shown at 12, said sleeve being secured to the end of the drum shaft 13 as bymeans of a threaded joint 14 and being revolubly mounted as by means of an anti-friction bearing 15 in the head 16 of a casing 17, said follower having a bearing pin 18 operating in a bore 19 of the drum shaft for terminal contact with a transverse key or gib 2O fitted in a transverse slot or keyway 21 in the drum shaft for contact with the adjacent head 22 of the drum, together with means for imparting longitudinal movement to the follower, and consisting in the construction illustrated of a piston 23 mounted in the cylinder 17 and adapted for actuation either by pressure admitted through the valved inlet 24 or man ually through the agency of the feed screw 25 fitted with a crank 26.

' In the construction illustrated the piston is keyed as at 27 in the cylinder so as to pre-. vent rotary movement thereof and suitable lubricating means such as oil cups 28 and 29 I a are arranged in communication with the guides 27 and the bearing of the sleeve 11 in the head 16. Also a drain cock 30 is pro Vided in communication with the cylinder between the piston 23 and the head 31 in which is mounted the feed screw25. The shank 32 of the feed screw passes through a suitable stufling box 33, anda compression spring 3 1 is interposed between the head 31 and the end of the piston'to'serve as a cushioning agency for the return or backward movement of the piston.

The communication of pressure from the piston to the follower'lO is through an antifri'ction'end bearin 35 permitting of the n free rotary movement of the follower with the sleeve 11 which in turn is free to rotate with the drum shaft 13 by reason of the antifriction bearing 15 formed by an outwardly directed flange 36 on the sleeve arranged in opposing relation to a shoulder 37 on the cylinder head 16. Also a cushioning spring 38 is interposed between the followerand the end. of the shaft 13 to yieldingly resist the advance movement of the follower and return the same when pressure upon the piston has been relieved, so as to release the key or gib 20 by which pressure is communicated to the head of the drum.

When pressure is applied to the piston, either mechanically as by steam or com pressed air admitted through the valve port 24, or manually by means of the crank 26, it causes the advance of the follower 10 to communicate corresponding movement through the follower pin 18 to the key or gib 20, but while the sleeve 11 is free to rotate with the drum shaft 13, endwise movement of the latter is prevented by the anti-friction bearing 15, so that movement in one direction is 'imparted'by the follower to thehead 22 of the drum which carries the friction disk 38, causing it to engage the friction blocks 40 carried byithe disk 39 mounted on the drum shaft, said friction blocks and disks consti tilting the friction clutch by which the rotarv motion is communicated from the shaft to the drum.

mechanically has the advantage of closing the drum clutch with the required force which is imposed upon the key or gib 20, which is common in devices of this class or designed for this purpose and does not tend to wear or break the same for the reason that the follower pin through which thepressure is applied is rotatable with and at the-same rate of motion as the shaft and key, owing 7:1. A friction apparatus for a hoisting v drum including a drum shaft and a drum revolubly mounted thereon, a clutch hav; ing its members carried respectively. by the drum and shaft, a follower operatively con' nected with the drum to effect longitudinal movement of the latter for the engagement of said clutch members, and means for applying pressureto the follower consisting of a cylinder, a. pistonv keyed to and longitudinally movable in the cylinder andhavinga thrust bearing againstthe follower, fluid means for imparting endwise pressure to the piston, and manual means for actuating the piston selectively as against saidfiuid means, and embodying .a feed,screwuconnected withthe piston, a stuffing box through which the extremity of said feed screweX- tends, and a crank handle for actuating said feed screw. j

2. A friction apparatus for hoisting drum includinga drum shaft and a drum revolubly mounted thereon, a clutch having its members carried respectively by the drum and shaft and a keyor gib slidably mounted on the shaftfor longitudinally moving the drum to close the clutch, a revoluble guide sleeve secured to the drum shaft, a follower fitted for longitudinal movement in the sleeve and provided with means for advancing the key orgib, and means for applying pressure to the follower to impart. longitudinal movement thereto, consisting of a cylinder in one head of which said sleeve is mounted, a piston keyed to and longitudinally movable in the cylinder and having a thrust bearing against the follower and meansrfor applying 'endwise pressure to the piston. 1 r I 3. A friction apparatus for a hoisting drum including a drum. shaft and a drum revolubly mounted thereon, a. clutch havingits members carried respectively by the drum and shaftand a key or gib slidably mounted on the shaft for longitudinally moving the drum to close the clutch, a rev oluble guide sleeve secured to the drum shaft, a follower fitted for longitudinal movement in the sleeve and provided with means for advancing the key or gib, and means forapplying pressure to the follower toimpart longitudinal movement thereto and consisting of a cylinder provided with a valved pressure inlet port, a piston keyed for longitudinal movement in the cylinder and having'a thrust bearing against the follower and a cushioning spring for resisting return'movement of the piston.

In testimony whereof I allix my signature.

JAMES M. McLAUGI-ILIN. 

